Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a204c281641e69…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 16:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9c1b6da85f5745ae857fc61d4de5512d SHA-1: 9b7cde086a93e398ff2858f54478a0efd1178c07 SHA-256: 67a204c281641e69fb5d909e1f447506ee0396f4e34c566621606af50df121eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs, many of which point to PDF files on distinct hosts, indicating a link farm designed to redirect users. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's purpose is to host a collection of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.area-tlc.com/public/ckfinder/userfiles/files/raxobokafofe.pdf In PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/24515897945.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210913065605.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/zovezamexeko.pdfIn PDF document text
    • https://equimat-cheval.fr/file/wanavat.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/70840858950.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/zubajurevoluboxitet.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/kurosak.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/kadekorafenulimete.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/kurezuvizefivo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/bawuwebojemuvopufuzixe.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/rokofipalazoduw.pdfIn PDF document text
    • http://yoron.net/up/files/xumugunegirobelules.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/lejutoke.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/mojogigusejivotoxipimula.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/jovoperoxuweliziwa.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/92595110523.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/1j2nh5o65qcurbuve134k8sc6c/54773582608.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/95615304622.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/12699683159.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/rotidezipexulopaxugejosox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=apk+mod+cyberikaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 10584 bytes
SHA-256: 117ae313aaf8ac8cc179342ef80d43ac01da9572ae545f8635ad316b273461e7
font_02_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 17204 bytes
SHA-256: 2ea402211a04b42829131b256b038535a9838c168650977e2e096a9ae3dfeeb6

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